Throat-plate for sewing-machines.



C. MCNEIL. TI- IROAT PLATE FOR SEWING MACHINES. APPL|CAT|0NF|LED1L|LY 20.1915.

1l yy'; Patented. May 21, 1918.

59.159272 L9 a y f funrrnn srarns namur eenen.

CHESTER yllflfcfhl'l.IL, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

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Specification of Letters Patent.

Patented ll/fay 21, 1918..

Application filed .Tuly 20, 1915. Serial No. 40,885.

To aZZ whom t may concern:

Be it known that I, CHESTER MCNEIL, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in rThroat-Plates for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to `new and useful improvements in throat plates for sewing machines and more particularly toa throat plate which is adapted to be used in connection with a stitching mechanism for forming a `flat seam.

' `ein object of the invention is to provide a throat lplate having feed slots in which a feed-dogoperates to feed the abutted edges of fabric sections, with stitch tongues located between the feed slots, and one in rear of the other, Asaid stitch tongues being staggered relative to each other in the line of feed, whereby the cross threads laid across the rear stitch tongue will partially cover the cross threads laid across the forward stitch tongue.

A further object of theinvention is to provide a throat plate having parallel'spaced feed slots with two separate needle openings located between said feed slots and staggered relative to each other and relative to the direction of feed, said plate having stitch tongues projecting into the respective openings, across which tongues the cross threads of separate stitching mechanisms are respectively laid.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings,-

Figure 1 is a plan view of a throat plate embodying my improvements;

Fig. 2 is a plan view of the front end of a work support showing a presser foot co'- operating with my improved throat plate and also the position ofthe needles;

Fig. 3 is a plan view of the forward end or the work support with my improved throat plate attached; 'also showing the feed dog;

Fig. 4 is aidetail partly in side elevation and partly in vertical section, showing the thro-at plate, the feed dog, the needles, the loopers coperating therewith and the presser foot;

Fig. 5 is a` perspective view of a slight modified form of throat plate;

Fig. 6 is a perspective view of the feed dog cooperating` with the throat plate shown in Fig. 5; and

Fig. 7 is an enlarged detail, showing in bottom plan, two sections of fabric stitched on my improved throat plate. v

I have shown my improved throat plate 1 as secured to the free end of a cylindrical work support 2. The throat plate is secured thereto by suitable screws 3 3. The throat plate is vformed with parallel openings 6 and 7, which are spaced from each other and receive the outer webs of the feed dog 8. Said throat plate is also provided with openings 9 and 10 for other feeding webs on the feed dog.` The throat plate is provided with an opening 11, anda stitch tongue 12 which is carried by the forward wall of the opening and projects rearwardly into the opening. Said throat plate 'is also provided with a sec* ond opening 13 and a stitch tongue 14 which is carried by the forward wall of the said opening and` projects rearwardly into the same.

As clearly shown in Fig. 3, the needles 15 and 16 are spaced to enter the opening 11 in the throat plate at each side of the stitch tongue 12, while' the needles 17 and 18 enter the opening 13 at each side of the stitch tongue 14. Coperating with the needles 15 and 16, beneath the work support, is a looper 19, while coperating with' the needles 17 and 18, beneath the work support, is a looper 20. `A presser foot 21 operates to hold `the material on the throat plate and this presser foot is provided with a needle opening 22 and a stitch tongue 23 for the rear pair of 24 and a stitch tongue 25 for the forward pair of needles 17 and 18.

In F ig. 7 of the drawings, I have shown the lower face of a fabric stitched on my improved throat plate. The said fabric is formed with two sections f and f" which meet at f2. rl`he fabric is' fed vin the direction of the arrow. The needles 17 and'lS form theneedle -loops a and Z), respectively,

while the needles 15 and A16 `formthe loops c and d, respectively. The looper 20 carries the looper thread e, whilethelooper `19 carrthe looper thread g,

'Ihe looper Athread e is laid across the stitch tongue 14, while thelooper-threadg is laid across the stitch tongue 12. The fabric sections `areJfed-to the machine, softhat the -edges pass between the needles 15- and 18.I The looper thread e is interlooped with the needle loops'a and b, and asthe looper threads slide off'from' the stitch tongue 111, theyfwill pass over thethroat plateinfrear of the opening 13` and may be drawn down fiat against the fabric. The looper thread g is vthen laid across the rear .stitch tongue 12 and overlaps and ties down a portion of. the cross threads connecting the needleloops a and b, as yclearly shown in 'Fig'.7 of the drawings. In other words, by myimproved v throat plate and arrangement of stitching mechanisrmfI am able to vformcomplete stitches which join and cover the meeting edges of the fabric and'subsequently-form completestitches which likewise join and cover the meetingedges of the fabric and also overlap and/tie down a portionof ,the firstformed stitches.

In Fig. 5 ofthe drawings, I have shown my improved throat plate 1 as having feed slots, 6,7 and 9, and also ashaving an elongated opening 25. The feed dogS is provided with a plate 26 which reciprocatesin' the-opening 25- This plate is formedwith `needle openings 27 and 28, which are respectivelv similar to the openings 11 and 13, above described. These opemngsy are respectively provided with stitch tongues 29 and 30, which are lilrewisesimilar tol the stitch tongues 12 and 141, above described. In other words, I have shown in Fig; 5 .that

` I consider the placing of. the stitch tongues on the' feedy dog the full equivalent of the placing'of the stitch tongueson the throat plate, kand althoughI have described. and claimedv specifically a throat `:plate 'const-'ruction, itv is to be understood that the claims are intended to cover 'the placingy of the stitchtongues on the feed'dog aswell.

Fromthe above, it will be noted that the rear fpair of needles are so disposed relative to ythefront pair of needles-that one needle of ea'ch pair is locatedf'in a lineV parallel with the line of feed and passing between the other pair of needles. It is this arrangement of the needles relative to each other that produces the overlapping cross threads of the stitching mechanisms in the finished seam. It will also be noted that the rear stitch tongue 12'is supported by the throat plate which is in the form of a bar extending crosswise and separating the needle-openings. lThis cross bar serves-to insure thestit'ches' as 'they pass-'olf from the first stitch tongue passing upon to the throat plate yand 'over 'the top of the rear stitch tongue.

` I It' isobvious that minor changes in the details.ofconstruction and arrangement of parts may be made without departing from the spirit of the-invention as set forth in the appended claims.

Having thus described my invention, what I -claim as new and desireto'secure by Letters Patent, is:

y.1. 'A throat plate having a feedslot and needleI openings, said needle openings being 4,staggered Arelative to each other in the direction ofi the line of feed, said throat plate having a stitch tongue extending into 'each needle opening, said stitch tongue in the 'rear lneedleopening having a portion thereof1 directly-in rear of a portion of the stitch vtongue Iin* the front needle opening, the center line of the stitch tongue in the rear needle opening being at one side of the center line of the stitch tongue in the front needle opening, wherebyvthe ythreads of the front. stitching lmechanisinwill be covered infpart only by the threads'of the rear stitching mechanism.

.2. -Athroat plate havingparallel spaced feedv slots and-needle openings arrangedbetween said feed slots, said needle openings being staggered relative to each other in the direction of the line of feed, said throat plate having a stitch tongue extending into each needle opening, thestitch tongue in the rear needle opening being disposed in a line parallel withthe line of feed andlocated at one side of a line parallel with the line of feed passing through the other stitch tongue, whereby the threadsof the front stitching mechanismavill becovered in part by the threads of the rear stitching mechanism.

.3. A throat plate having two separated needle openings, one in rear of the other, saidy openings being staggered relative to each other in the direction yof the line of feed, and a stitch tongue extending rearwardly into each needle opening, the inner side edge of each stitch tongue being disposed in a line parallelwith the line of feed and passing through the other stitch tongue. v

a L The combination of a throat plate having spaced feed slots, a feed dog coperating with the throat plate, one of said elements having needle openings therein, a stitch tongue projecting into each needle opening, said needle openings being staggered relative to each other in the direction of the line of feed, whereby pairs of needles entering the respective needle openings may be disposed so that one needle of `each pair is located in a line parallel with the line of l@ feed and passing between the other pair of needles.

In testimony whereof, I acx my signer ture, in the presence of two witnesses.

CHESTER MCNEIL. Witnesses:

GEORGE TATE, A. F. BREDSHAIJJ.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner oi Patents,

' Washington, 1D. 0U. 

